golang.org/toolchain@v0.0.1-go1.9rc2.windows-amd64/src/syscall/syscall_windows.go (about) 1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // Windows system calls. 6 7 package syscall 8 9 import ( 10 errorspkg "errors" 11 "internal/race" 12 "sync" 13 "unicode/utf16" 14 "unsafe" 15 ) 16 17 type Handle uintptr 18 19 const InvalidHandle = ^Handle(0) 20 21 // StringToUTF16 returns the UTF-16 encoding of the UTF-8 string s, 22 // with a terminating NUL added. If s contains a NUL byte this 23 // function panics instead of returning an error. 24 // 25 // Deprecated: Use UTF16FromString instead. 26 func StringToUTF16(s string) []uint16 { 27 a, err := UTF16FromString(s) 28 if err != nil { 29 panic("syscall: string with NUL passed to StringToUTF16") 30 } 31 return a 32 } 33 34 // UTF16FromString returns the UTF-16 encoding of the UTF-8 string 35 // s, with a terminating NUL added. If s contains a NUL byte at any 36 // location, it returns (nil, EINVAL). 37 func UTF16FromString(s string) ([]uint16, error) { 38 for i := 0; i < len(s); i++ { 39 if s[i] == 0 { 40 return nil, EINVAL 41 } 42 } 43 return utf16.Encode([]rune(s + "\x00")), nil 44 } 45 46 // UTF16ToString returns the UTF-8 encoding of the UTF-16 sequence s, 47 // with a terminating NUL removed. 48 func UTF16ToString(s []uint16) string { 49 for i, v := range s { 50 if v == 0 { 51 s = s[0:i] 52 break 53 } 54 } 55 return string(utf16.Decode(s)) 56 } 57 58 // StringToUTF16Ptr returns pointer to the UTF-16 encoding of 59 // the UTF-8 string s, with a terminating NUL added. If s 60 // contains a NUL byte this function panics instead of 61 // returning an error. 62 // 63 // Deprecated: Use UTF16PtrFromString instead. 64 func StringToUTF16Ptr(s string) *uint16 { return &StringToUTF16(s)[0] } 65 66 // UTF16PtrFromString returns pointer to the UTF-16 encoding of 67 // the UTF-8 string s, with a terminating NUL added. If s 68 // contains a NUL byte at any location, it returns (nil, EINVAL). 69 func UTF16PtrFromString(s string) (*uint16, error) { 70 a, err := UTF16FromString(s) 71 if err != nil { 72 return nil, err 73 } 74 return &a[0], nil 75 } 76 77 // Errno is the Windows error number. 78 type Errno uintptr 79 80 func langid(pri, sub uint16) uint32 { return uint32(sub)<<10 | uint32(pri) } 81 82 // FormatMessage is deprecated (msgsrc should be uintptr, not uint32, but can 83 // not be changed due to the Go 1 compatibility guarantee). 84 // 85 // Deprecated: Use FormatMessage from golang.org/x/sys/windows instead. 86 func FormatMessage(flags uint32, msgsrc uint32, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) { 87 return formatMessage(flags, uintptr(msgsrc), msgid, langid, buf, args) 88 } 89 90 func (e Errno) Error() string { 91 // deal with special go errors 92 idx := int(e - APPLICATION_ERROR) 93 if 0 <= idx && idx < len(errors) { 94 return errors[idx] 95 } 96 // ask windows for the remaining errors 97 var flags uint32 = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_IGNORE_INSERTS 98 b := make([]uint16, 300) 99 n, err := formatMessage(flags, 0, uint32(e), langid(LANG_ENGLISH, SUBLANG_ENGLISH_US), b, nil) 100 if err != nil { 101 n, err = formatMessage(flags, 0, uint32(e), 0, b, nil) 102 if err != nil { 103 return "winapi error #" + itoa(int(e)) 104 } 105 } 106 // trim terminating \r and \n 107 for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- { 108 } 109 return string(utf16.Decode(b[:n])) 110 } 111 112 func (e Errno) Temporary() bool { 113 return e == EINTR || e == EMFILE || e == WSAECONNABORTED || e == WSAECONNRESET || e.Timeout() 114 } 115 116 func (e Errno) Timeout() bool { 117 return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT 118 } 119 120 // Implemented in runtime/syscall_windows.go. 121 func compileCallback(fn interface{}, cleanstack bool) uintptr 122 123 // Converts a Go function to a function pointer conforming 124 // to the stdcall calling convention. This is useful when 125 // interoperating with Windows code requiring callbacks. 126 func NewCallback(fn interface{}) uintptr { 127 return compileCallback(fn, true) 128 } 129 130 // Converts a Go function to a function pointer conforming 131 // to the cdecl calling convention. This is useful when 132 // interoperating with Windows code requiring callbacks. 133 func NewCallbackCDecl(fn interface{}) uintptr { 134 return compileCallback(fn, false) 135 } 136 137 // windows api calls 138 139 //sys GetLastError() (lasterr error) 140 //sys LoadLibrary(libname string) (handle Handle, err error) = LoadLibraryW 141 //sys FreeLibrary(handle Handle) (err error) 142 //sys GetProcAddress(module Handle, procname string) (proc uintptr, err error) 143 //sys GetVersion() (ver uint32, err error) 144 //sys formatMessage(flags uint32, msgsrc uintptr, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) = FormatMessageW 145 //sys ExitProcess(exitcode uint32) 146 //sys CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval==InvalidHandle] = CreateFileW 147 //sys ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) 148 //sys WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) 149 //sys SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff] 150 //sys CloseHandle(handle Handle) (err error) 151 //sys GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle] 152 //sys findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW 153 //sys findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW 154 //sys FindClose(handle Handle) (err error) 155 //sys GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (err error) 156 //sys GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, err error) = GetCurrentDirectoryW 157 //sys SetCurrentDirectory(path *uint16) (err error) = SetCurrentDirectoryW 158 //sys CreateDirectory(path *uint16, sa *SecurityAttributes) (err error) = CreateDirectoryW 159 //sys RemoveDirectory(path *uint16) (err error) = RemoveDirectoryW 160 //sys DeleteFile(path *uint16) (err error) = DeleteFileW 161 //sys MoveFile(from *uint16, to *uint16) (err error) = MoveFileW 162 //sys GetComputerName(buf *uint16, n *uint32) (err error) = GetComputerNameW 163 //sys SetEndOfFile(handle Handle) (err error) 164 //sys GetSystemTimeAsFileTime(time *Filetime) 165 //sys GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) [failretval==0xffffffff] 166 //sys CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (handle Handle, err error) 167 //sys GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (err error) 168 //sys PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uint32, overlapped *Overlapped) (err error) 169 //sys CancelIo(s Handle) (err error) 170 //sys CancelIoEx(s Handle, o *Overlapped) (err error) 171 //sys CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (err error) = CreateProcessW 172 //sys OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err error) 173 //sys TerminateProcess(handle Handle, exitcode uint32) (err error) 174 //sys GetExitCodeProcess(handle Handle, exitcode *uint32) (err error) 175 //sys GetStartupInfo(startupInfo *StartupInfo) (err error) = GetStartupInfoW 176 //sys GetCurrentProcess() (pseudoHandle Handle, err error) 177 //sys GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error) 178 //sys DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error) 179 //sys WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff] 180 //sys GetTempPath(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPathW 181 //sys CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (err error) 182 //sys GetFileType(filehandle Handle) (n uint32, err error) 183 //sys CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (err error) = advapi32.CryptAcquireContextW 184 //sys CryptReleaseContext(provhandle Handle, flags uint32) (err error) = advapi32.CryptReleaseContext 185 //sys CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (err error) = advapi32.CryptGenRandom 186 //sys GetEnvironmentStrings() (envs *uint16, err error) [failretval==nil] = kernel32.GetEnvironmentStringsW 187 //sys FreeEnvironmentStrings(envs *uint16) (err error) = kernel32.FreeEnvironmentStringsW 188 //sys GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, err error) = kernel32.GetEnvironmentVariableW 189 //sys SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW 190 //sys SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error) 191 //sys GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW 192 //sys SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW 193 //sys GetFileAttributesEx(name *uint16, level uint32, info *byte) (err error) = kernel32.GetFileAttributesExW 194 //sys GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW 195 //sys CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) [failretval==nil] = shell32.CommandLineToArgvW 196 //sys LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0] 197 //sys SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error) 198 //sys FlushFileBuffers(handle Handle) (err error) 199 //sys GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW 200 //sys GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW 201 //sys GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW 202 //sys CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, err error) = kernel32.CreateFileMappingW 203 //sys MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error) 204 //sys UnmapViewOfFile(addr uintptr) (err error) 205 //sys FlushViewOfFile(addr uintptr, length uintptr) (err error) 206 //sys VirtualLock(addr uintptr, length uintptr) (err error) 207 //sys VirtualUnlock(addr uintptr, length uintptr) (err error) 208 //sys TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (err error) = mswsock.TransmitFile 209 //sys ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree bool, mask uint32, retlen *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) = kernel32.ReadDirectoryChangesW 210 //sys CertOpenSystemStore(hprov Handle, name *uint16) (store Handle, err error) = crypt32.CertOpenSystemStoreW 211 //sys CertOpenStore(storeProvider uintptr, msgAndCertEncodingType uint32, cryptProv uintptr, flags uint32, para uintptr) (handle Handle, err error) [failretval==InvalidHandle] = crypt32.CertOpenStore 212 //sys CertEnumCertificatesInStore(store Handle, prevContext *CertContext) (context *CertContext, err error) [failretval==nil] = crypt32.CertEnumCertificatesInStore 213 //sys CertAddCertificateContextToStore(store Handle, certContext *CertContext, addDisposition uint32, storeContext **CertContext) (err error) = crypt32.CertAddCertificateContextToStore 214 //sys CertCloseStore(store Handle, flags uint32) (err error) = crypt32.CertCloseStore 215 //sys CertGetCertificateChain(engine Handle, leaf *CertContext, time *Filetime, additionalStore Handle, para *CertChainPara, flags uint32, reserved uintptr, chainCtx **CertChainContext) (err error) = crypt32.CertGetCertificateChain 216 //sys CertFreeCertificateChain(ctx *CertChainContext) = crypt32.CertFreeCertificateChain 217 //sys CertCreateCertificateContext(certEncodingType uint32, certEncoded *byte, encodedLen uint32) (context *CertContext, err error) [failretval==nil] = crypt32.CertCreateCertificateContext 218 //sys CertFreeCertificateContext(ctx *CertContext) (err error) = crypt32.CertFreeCertificateContext 219 //sys CertVerifyCertificateChainPolicy(policyOID uintptr, chain *CertChainContext, para *CertChainPolicyPara, status *CertChainPolicyStatus) (err error) = crypt32.CertVerifyCertificateChainPolicy 220 //sys RegOpenKeyEx(key Handle, subkey *uint16, options uint32, desiredAccess uint32, result *Handle) (regerrno error) = advapi32.RegOpenKeyExW 221 //sys RegCloseKey(key Handle) (regerrno error) = advapi32.RegCloseKey 222 //sys RegQueryInfoKey(key Handle, class *uint16, classLen *uint32, reserved *uint32, subkeysLen *uint32, maxSubkeyLen *uint32, maxClassLen *uint32, valuesLen *uint32, maxValueNameLen *uint32, maxValueLen *uint32, saLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegQueryInfoKeyW 223 //sys RegEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegEnumKeyExW 224 //sys RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW 225 //sys getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId 226 //sys GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode 227 //sys WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW 228 //sys ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW 229 //sys CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot 230 //sys Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW 231 //sys Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW 232 //sys DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error) 233 // This function returns 1 byte BOOLEAN rather than the 4 byte BOOL. 234 //sys CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW 235 //sys CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW 236 237 // syscall interface implementation for other packages 238 239 // Implemented in ../runtime/syscall_windows.go. 240 func Exit(code int) 241 242 func makeInheritSa() *SecurityAttributes { 243 var sa SecurityAttributes 244 sa.Length = uint32(unsafe.Sizeof(sa)) 245 sa.InheritHandle = 1 246 return &sa 247 } 248 249 func Open(path string, mode int, perm uint32) (fd Handle, err error) { 250 if len(path) == 0 { 251 return InvalidHandle, ERROR_FILE_NOT_FOUND 252 } 253 pathp, err := UTF16PtrFromString(path) 254 if err != nil { 255 return InvalidHandle, err 256 } 257 var access uint32 258 switch mode & (O_RDONLY | O_WRONLY | O_RDWR) { 259 case O_RDONLY: 260 access = GENERIC_READ 261 case O_WRONLY: 262 access = GENERIC_WRITE 263 case O_RDWR: 264 access = GENERIC_READ | GENERIC_WRITE 265 } 266 if mode&O_CREAT != 0 { 267 access |= GENERIC_WRITE 268 } 269 if mode&O_APPEND != 0 { 270 access &^= GENERIC_WRITE 271 access |= FILE_APPEND_DATA 272 } 273 sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE) 274 var sa *SecurityAttributes 275 if mode&O_CLOEXEC == 0 { 276 sa = makeInheritSa() 277 } 278 var createmode uint32 279 switch { 280 case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL): 281 createmode = CREATE_NEW 282 case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC): 283 createmode = CREATE_ALWAYS 284 case mode&O_CREAT == O_CREAT: 285 createmode = OPEN_ALWAYS 286 case mode&O_TRUNC == O_TRUNC: 287 createmode = TRUNCATE_EXISTING 288 default: 289 createmode = OPEN_EXISTING 290 } 291 h, e := CreateFile(pathp, access, sharemode, sa, createmode, FILE_ATTRIBUTE_NORMAL, 0) 292 return h, e 293 } 294 295 func Read(fd Handle, p []byte) (n int, err error) { 296 var done uint32 297 e := ReadFile(fd, p, &done, nil) 298 if e != nil { 299 if e == ERROR_BROKEN_PIPE { 300 // NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin 301 return 0, nil 302 } 303 return 0, e 304 } 305 if race.Enabled { 306 if done > 0 { 307 race.WriteRange(unsafe.Pointer(&p[0]), int(done)) 308 } 309 race.Acquire(unsafe.Pointer(&ioSync)) 310 } 311 if msanenabled && done > 0 { 312 msanWrite(unsafe.Pointer(&p[0]), int(done)) 313 } 314 return int(done), nil 315 } 316 317 func Write(fd Handle, p []byte) (n int, err error) { 318 if race.Enabled { 319 race.ReleaseMerge(unsafe.Pointer(&ioSync)) 320 } 321 var done uint32 322 e := WriteFile(fd, p, &done, nil) 323 if e != nil { 324 return 0, e 325 } 326 if race.Enabled && done > 0 { 327 race.ReadRange(unsafe.Pointer(&p[0]), int(done)) 328 } 329 if msanenabled && done > 0 { 330 msanRead(unsafe.Pointer(&p[0]), int(done)) 331 } 332 return int(done), nil 333 } 334 335 var ioSync int64 336 337 func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) { 338 var w uint32 339 switch whence { 340 case 0: 341 w = FILE_BEGIN 342 case 1: 343 w = FILE_CURRENT 344 case 2: 345 w = FILE_END 346 } 347 hi := int32(offset >> 32) 348 lo := int32(offset) 349 // use GetFileType to check pipe, pipe can't do seek 350 ft, _ := GetFileType(fd) 351 if ft == FILE_TYPE_PIPE { 352 return 0, ESPIPE 353 } 354 rlo, e := SetFilePointer(fd, lo, &hi, w) 355 if e != nil { 356 return 0, e 357 } 358 return int64(hi)<<32 + int64(rlo), nil 359 } 360 361 func Close(fd Handle) (err error) { 362 return CloseHandle(fd) 363 } 364 365 var ( 366 Stdin = getStdHandle(STD_INPUT_HANDLE) 367 Stdout = getStdHandle(STD_OUTPUT_HANDLE) 368 Stderr = getStdHandle(STD_ERROR_HANDLE) 369 ) 370 371 func getStdHandle(h int) (fd Handle) { 372 r, _ := GetStdHandle(h) 373 CloseOnExec(r) 374 return r 375 } 376 377 const ImplementsGetwd = true 378 379 func Getwd() (wd string, err error) { 380 b := make([]uint16, 300) 381 n, e := GetCurrentDirectory(uint32(len(b)), &b[0]) 382 if e != nil { 383 return "", e 384 } 385 return string(utf16.Decode(b[0:n])), nil 386 } 387 388 func Chdir(path string) (err error) { 389 pathp, err := UTF16PtrFromString(path) 390 if err != nil { 391 return err 392 } 393 return SetCurrentDirectory(pathp) 394 } 395 396 func Mkdir(path string, mode uint32) (err error) { 397 pathp, err := UTF16PtrFromString(path) 398 if err != nil { 399 return err 400 } 401 return CreateDirectory(pathp, nil) 402 } 403 404 func Rmdir(path string) (err error) { 405 pathp, err := UTF16PtrFromString(path) 406 if err != nil { 407 return err 408 } 409 return RemoveDirectory(pathp) 410 } 411 412 func Unlink(path string) (err error) { 413 pathp, err := UTF16PtrFromString(path) 414 if err != nil { 415 return err 416 } 417 return DeleteFile(pathp) 418 } 419 420 func Rename(oldpath, newpath string) (err error) { 421 from, err := UTF16PtrFromString(oldpath) 422 if err != nil { 423 return err 424 } 425 to, err := UTF16PtrFromString(newpath) 426 if err != nil { 427 return err 428 } 429 return MoveFile(from, to) 430 } 431 432 func ComputerName() (name string, err error) { 433 var n uint32 = MAX_COMPUTERNAME_LENGTH + 1 434 b := make([]uint16, n) 435 e := GetComputerName(&b[0], &n) 436 if e != nil { 437 return "", e 438 } 439 return string(utf16.Decode(b[0:n])), nil 440 } 441 442 func Ftruncate(fd Handle, length int64) (err error) { 443 curoffset, e := Seek(fd, 0, 1) 444 if e != nil { 445 return e 446 } 447 defer Seek(fd, curoffset, 0) 448 _, e = Seek(fd, length, 0) 449 if e != nil { 450 return e 451 } 452 e = SetEndOfFile(fd) 453 if e != nil { 454 return e 455 } 456 return nil 457 } 458 459 func Gettimeofday(tv *Timeval) (err error) { 460 var ft Filetime 461 GetSystemTimeAsFileTime(&ft) 462 *tv = NsecToTimeval(ft.Nanoseconds()) 463 return nil 464 } 465 466 func Pipe(p []Handle) (err error) { 467 if len(p) != 2 { 468 return EINVAL 469 } 470 var r, w Handle 471 e := CreatePipe(&r, &w, makeInheritSa(), 0) 472 if e != nil { 473 return e 474 } 475 p[0] = r 476 p[1] = w 477 return nil 478 } 479 480 func Utimes(path string, tv []Timeval) (err error) { 481 if len(tv) != 2 { 482 return EINVAL 483 } 484 pathp, e := UTF16PtrFromString(path) 485 if e != nil { 486 return e 487 } 488 h, e := CreateFile(pathp, 489 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 490 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 491 if e != nil { 492 return e 493 } 494 defer Close(h) 495 a := NsecToFiletime(tv[0].Nanoseconds()) 496 w := NsecToFiletime(tv[1].Nanoseconds()) 497 return SetFileTime(h, nil, &a, &w) 498 } 499 500 func UtimesNano(path string, ts []Timespec) (err error) { 501 if len(ts) != 2 { 502 return EINVAL 503 } 504 pathp, e := UTF16PtrFromString(path) 505 if e != nil { 506 return e 507 } 508 h, e := CreateFile(pathp, 509 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 510 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 511 if e != nil { 512 return e 513 } 514 defer Close(h) 515 a := NsecToFiletime(TimespecToNsec(ts[0])) 516 w := NsecToFiletime(TimespecToNsec(ts[1])) 517 return SetFileTime(h, nil, &a, &w) 518 } 519 520 func Fsync(fd Handle) (err error) { 521 return FlushFileBuffers(fd) 522 } 523 524 func Chmod(path string, mode uint32) (err error) { 525 if mode == 0 { 526 return EINVAL 527 } 528 p, e := UTF16PtrFromString(path) 529 if e != nil { 530 return e 531 } 532 attrs, e := GetFileAttributes(p) 533 if e != nil { 534 return e 535 } 536 if mode&S_IWRITE != 0 { 537 attrs &^= FILE_ATTRIBUTE_READONLY 538 } else { 539 attrs |= FILE_ATTRIBUTE_READONLY 540 } 541 return SetFileAttributes(p, attrs) 542 } 543 544 func LoadCancelIoEx() error { 545 return procCancelIoEx.Find() 546 } 547 548 func LoadSetFileCompletionNotificationModes() error { 549 return procSetFileCompletionNotificationModes.Find() 550 } 551 552 // net api calls 553 554 const socket_error = uintptr(^uint32(0)) 555 556 //sys WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup 557 //sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup 558 //sys WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) [failretval==socket_error] = ws2_32.WSAIoctl 559 //sys socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket 560 //sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt 561 //sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt 562 //sys bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind 563 //sys connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect 564 //sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname 565 //sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername 566 //sys listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen 567 //sys shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown 568 //sys Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket 569 //sys AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx 570 //sys GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs 571 //sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv 572 //sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend 573 //sys WSARecvFrom(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecvFrom 574 //sys WSASendTo(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASendTo 575 //sys GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname 576 //sys GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname 577 //sys Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs 578 //sys GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname 579 //sys DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W 580 //sys DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree 581 //sys DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W 582 //sys GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW 583 //sys FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW 584 //sys GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry 585 //sys GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo 586 //sys SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes 587 //sys WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW 588 589 // For testing: clients can set this flag to force 590 // creation of IPv6 sockets to return EAFNOSUPPORT. 591 var SocketDisableIPv6 bool 592 593 type RawSockaddrInet4 struct { 594 Family uint16 595 Port uint16 596 Addr [4]byte /* in_addr */ 597 Zero [8]uint8 598 } 599 600 type RawSockaddrInet6 struct { 601 Family uint16 602 Port uint16 603 Flowinfo uint32 604 Addr [16]byte /* in6_addr */ 605 Scope_id uint32 606 } 607 608 type RawSockaddr struct { 609 Family uint16 610 Data [14]int8 611 } 612 613 type RawSockaddrAny struct { 614 Addr RawSockaddr 615 Pad [96]int8 616 } 617 618 type Sockaddr interface { 619 sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs 620 } 621 622 type SockaddrInet4 struct { 623 Port int 624 Addr [4]byte 625 raw RawSockaddrInet4 626 } 627 628 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) { 629 if sa.Port < 0 || sa.Port > 0xFFFF { 630 return nil, 0, EINVAL 631 } 632 sa.raw.Family = AF_INET 633 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 634 p[0] = byte(sa.Port >> 8) 635 p[1] = byte(sa.Port) 636 for i := 0; i < len(sa.Addr); i++ { 637 sa.raw.Addr[i] = sa.Addr[i] 638 } 639 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 640 } 641 642 type SockaddrInet6 struct { 643 Port int 644 ZoneId uint32 645 Addr [16]byte 646 raw RawSockaddrInet6 647 } 648 649 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) { 650 if sa.Port < 0 || sa.Port > 0xFFFF { 651 return nil, 0, EINVAL 652 } 653 sa.raw.Family = AF_INET6 654 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 655 p[0] = byte(sa.Port >> 8) 656 p[1] = byte(sa.Port) 657 sa.raw.Scope_id = sa.ZoneId 658 for i := 0; i < len(sa.Addr); i++ { 659 sa.raw.Addr[i] = sa.Addr[i] 660 } 661 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 662 } 663 664 type SockaddrUnix struct { 665 Name string 666 } 667 668 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) { 669 // TODO(brainman): implement SockaddrUnix.sockaddr() 670 return nil, 0, EWINDOWS 671 } 672 673 func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) { 674 switch rsa.Addr.Family { 675 case AF_UNIX: 676 return nil, EWINDOWS 677 678 case AF_INET: 679 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 680 sa := new(SockaddrInet4) 681 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 682 sa.Port = int(p[0])<<8 + int(p[1]) 683 for i := 0; i < len(sa.Addr); i++ { 684 sa.Addr[i] = pp.Addr[i] 685 } 686 return sa, nil 687 688 case AF_INET6: 689 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 690 sa := new(SockaddrInet6) 691 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 692 sa.Port = int(p[0])<<8 + int(p[1]) 693 sa.ZoneId = pp.Scope_id 694 for i := 0; i < len(sa.Addr); i++ { 695 sa.Addr[i] = pp.Addr[i] 696 } 697 return sa, nil 698 } 699 return nil, EAFNOSUPPORT 700 } 701 702 func Socket(domain, typ, proto int) (fd Handle, err error) { 703 if domain == AF_INET6 && SocketDisableIPv6 { 704 return InvalidHandle, EAFNOSUPPORT 705 } 706 return socket(int32(domain), int32(typ), int32(proto)) 707 } 708 709 func SetsockoptInt(fd Handle, level, opt int, value int) (err error) { 710 v := int32(value) 711 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v))) 712 } 713 714 func Bind(fd Handle, sa Sockaddr) (err error) { 715 ptr, n, err := sa.sockaddr() 716 if err != nil { 717 return err 718 } 719 return bind(fd, ptr, n) 720 } 721 722 func Connect(fd Handle, sa Sockaddr) (err error) { 723 ptr, n, err := sa.sockaddr() 724 if err != nil { 725 return err 726 } 727 return connect(fd, ptr, n) 728 } 729 730 func Getsockname(fd Handle) (sa Sockaddr, err error) { 731 var rsa RawSockaddrAny 732 l := int32(unsafe.Sizeof(rsa)) 733 if err = getsockname(fd, &rsa, &l); err != nil { 734 return 735 } 736 return rsa.Sockaddr() 737 } 738 739 func Getpeername(fd Handle) (sa Sockaddr, err error) { 740 var rsa RawSockaddrAny 741 l := int32(unsafe.Sizeof(rsa)) 742 if err = getpeername(fd, &rsa, &l); err != nil { 743 return 744 } 745 return rsa.Sockaddr() 746 } 747 748 func Listen(s Handle, n int) (err error) { 749 return listen(s, int32(n)) 750 } 751 752 func Shutdown(fd Handle, how int) (err error) { 753 return shutdown(fd, int32(how)) 754 } 755 756 func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) { 757 rsa, l, err := to.sockaddr() 758 if err != nil { 759 return err 760 } 761 return WSASendTo(s, bufs, bufcnt, sent, flags, (*RawSockaddrAny)(unsafe.Pointer(rsa)), l, overlapped, croutine) 762 } 763 764 func LoadGetAddrInfo() error { 765 return procGetAddrInfoW.Find() 766 } 767 768 var connectExFunc struct { 769 once sync.Once 770 addr uintptr 771 err error 772 } 773 774 func LoadConnectEx() error { 775 connectExFunc.once.Do(func() { 776 var s Handle 777 s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) 778 if connectExFunc.err != nil { 779 return 780 } 781 defer CloseHandle(s) 782 var n uint32 783 connectExFunc.err = WSAIoctl(s, 784 SIO_GET_EXTENSION_FUNCTION_POINTER, 785 (*byte)(unsafe.Pointer(&WSAID_CONNECTEX)), 786 uint32(unsafe.Sizeof(WSAID_CONNECTEX)), 787 (*byte)(unsafe.Pointer(&connectExFunc.addr)), 788 uint32(unsafe.Sizeof(connectExFunc.addr)), 789 &n, nil, 0) 790 }) 791 return connectExFunc.err 792 } 793 794 func connectEx(s Handle, name unsafe.Pointer, namelen int32, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) (err error) { 795 r1, _, e1 := Syscall9(connectExFunc.addr, 7, uintptr(s), uintptr(name), uintptr(namelen), uintptr(unsafe.Pointer(sendBuf)), uintptr(sendDataLen), uintptr(unsafe.Pointer(bytesSent)), uintptr(unsafe.Pointer(overlapped)), 0, 0) 796 if r1 == 0 { 797 if e1 != 0 { 798 err = error(e1) 799 } else { 800 err = EINVAL 801 } 802 } 803 return 804 } 805 806 func ConnectEx(fd Handle, sa Sockaddr, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) error { 807 err := LoadConnectEx() 808 if err != nil { 809 return errorspkg.New("failed to find ConnectEx: " + err.Error()) 810 } 811 ptr, n, err := sa.sockaddr() 812 if err != nil { 813 return err 814 } 815 return connectEx(fd, ptr, n, sendBuf, sendDataLen, bytesSent, overlapped) 816 } 817 818 // Invented structures to support what package os expects. 819 type Rusage struct { 820 CreationTime Filetime 821 ExitTime Filetime 822 KernelTime Filetime 823 UserTime Filetime 824 } 825 826 type WaitStatus struct { 827 ExitCode uint32 828 } 829 830 func (w WaitStatus) Exited() bool { return true } 831 832 func (w WaitStatus) ExitStatus() int { return int(w.ExitCode) } 833 834 func (w WaitStatus) Signal() Signal { return -1 } 835 836 func (w WaitStatus) CoreDump() bool { return false } 837 838 func (w WaitStatus) Stopped() bool { return false } 839 840 func (w WaitStatus) Continued() bool { return false } 841 842 func (w WaitStatus) StopSignal() Signal { return -1 } 843 844 func (w WaitStatus) Signaled() bool { return false } 845 846 func (w WaitStatus) TrapCause() int { return -1 } 847 848 // Timespec is an invented structure on Windows, but here for 849 // consistency with the syscall package for other operating systems. 850 type Timespec struct { 851 Sec int64 852 Nsec int64 853 } 854 855 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) } 856 857 func NsecToTimespec(nsec int64) (ts Timespec) { 858 ts.Sec = nsec / 1e9 859 ts.Nsec = nsec % 1e9 860 return 861 } 862 863 // TODO(brainman): fix all needed for net 864 865 func Accept(fd Handle) (nfd Handle, sa Sockaddr, err error) { return 0, nil, EWINDOWS } 866 func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, err error) { 867 return 0, nil, EWINDOWS 868 } 869 func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (err error) { return EWINDOWS } 870 func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (err error) { return EWINDOWS } 871 872 // The Linger struct is wrong but we only noticed after Go 1. 873 // sysLinger is the real system call structure. 874 875 // BUG(brainman): The definition of Linger is not appropriate for direct use 876 // with Setsockopt and Getsockopt. 877 // Use SetsockoptLinger instead. 878 879 type Linger struct { 880 Onoff int32 881 Linger int32 882 } 883 884 type sysLinger struct { 885 Onoff uint16 886 Linger uint16 887 } 888 889 type IPMreq struct { 890 Multiaddr [4]byte /* in_addr */ 891 Interface [4]byte /* in_addr */ 892 } 893 894 type IPv6Mreq struct { 895 Multiaddr [16]byte /* in6_addr */ 896 Interface uint32 897 } 898 899 func GetsockoptInt(fd Handle, level, opt int) (int, error) { return -1, EWINDOWS } 900 901 func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (err error) { 902 sys := sysLinger{Onoff: uint16(l.Onoff), Linger: uint16(l.Linger)} 903 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&sys)), int32(unsafe.Sizeof(sys))) 904 } 905 906 func SetsockoptInet4Addr(fd Handle, level, opt int, value [4]byte) (err error) { 907 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&value[0])), 4) 908 } 909 func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (err error) { 910 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(mreq)), int32(unsafe.Sizeof(*mreq))) 911 } 912 func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) { return EWINDOWS } 913 914 func Getpid() (pid int) { return int(getCurrentProcessId()) } 915 916 func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) { 917 // NOTE(rsc): The Win32finddata struct is wrong for the system call: 918 // the two paths are each one uint16 short. Use the correct struct, 919 // a win32finddata1, and then copy the results out. 920 // There is no loss of expressivity here, because the final 921 // uint16, if it is used, is supposed to be a NUL, and Go doesn't need that. 922 // For Go 1.1, we might avoid the allocation of win32finddata1 here 923 // by adding a final Bug [2]uint16 field to the struct and then 924 // adjusting the fields in the result directly. 925 var data1 win32finddata1 926 handle, err = findFirstFile1(name, &data1) 927 if err == nil { 928 copyFindData(data, &data1) 929 } 930 return 931 } 932 933 func FindNextFile(handle Handle, data *Win32finddata) (err error) { 934 var data1 win32finddata1 935 err = findNextFile1(handle, &data1) 936 if err == nil { 937 copyFindData(data, &data1) 938 } 939 return 940 } 941 942 func getProcessEntry(pid int) (*ProcessEntry32, error) { 943 snapshot, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) 944 if err != nil { 945 return nil, err 946 } 947 defer CloseHandle(snapshot) 948 var procEntry ProcessEntry32 949 procEntry.Size = uint32(unsafe.Sizeof(procEntry)) 950 if err = Process32First(snapshot, &procEntry); err != nil { 951 return nil, err 952 } 953 for { 954 if procEntry.ProcessID == uint32(pid) { 955 return &procEntry, nil 956 } 957 err = Process32Next(snapshot, &procEntry) 958 if err != nil { 959 return nil, err 960 } 961 } 962 } 963 964 func Getppid() (ppid int) { 965 pe, err := getProcessEntry(Getpid()) 966 if err != nil { 967 return -1 968 } 969 return int(pe.ParentProcessID) 970 } 971 972 // TODO(brainman): fix all needed for os 973 func Fchdir(fd Handle) (err error) { return EWINDOWS } 974 func Link(oldpath, newpath string) (err error) { return EWINDOWS } 975 func Symlink(path, link string) (err error) { return EWINDOWS } 976 977 func Fchmod(fd Handle, mode uint32) (err error) { return EWINDOWS } 978 func Chown(path string, uid int, gid int) (err error) { return EWINDOWS } 979 func Lchown(path string, uid int, gid int) (err error) { return EWINDOWS } 980 func Fchown(fd Handle, uid int, gid int) (err error) { return EWINDOWS } 981 982 func Getuid() (uid int) { return -1 } 983 func Geteuid() (euid int) { return -1 } 984 func Getgid() (gid int) { return -1 } 985 func Getegid() (egid int) { return -1 } 986 func Getgroups() (gids []int, err error) { return nil, EWINDOWS } 987 988 type Signal int 989 990 func (s Signal) Signal() {} 991 992 func (s Signal) String() string { 993 if 0 <= s && int(s) < len(signals) { 994 str := signals[s] 995 if str != "" { 996 return str 997 } 998 } 999 return "signal " + itoa(int(s)) 1000 } 1001 1002 func LoadCreateSymbolicLink() error { 1003 return procCreateSymbolicLinkW.Find() 1004 } 1005 1006 // Readlink returns the destination of the named symbolic link. 1007 func Readlink(path string, buf []byte) (n int, err error) { 1008 fd, err := CreateFile(StringToUTF16Ptr(path), GENERIC_READ, 0, nil, OPEN_EXISTING, 1009 FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, 0) 1010 if err != nil { 1011 return -1, err 1012 } 1013 defer CloseHandle(fd) 1014 1015 rdbbuf := make([]byte, MAXIMUM_REPARSE_DATA_BUFFER_SIZE) 1016 var bytesReturned uint32 1017 err = DeviceIoControl(fd, FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil) 1018 if err != nil { 1019 return -1, err 1020 } 1021 1022 rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0])) 1023 var s string 1024 switch rdb.ReparseTag { 1025 case IO_REPARSE_TAG_SYMLINK: 1026 data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1027 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1028 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1029 if data.Flags&_SYMLINK_FLAG_RELATIVE == 0 { 1030 if len(s) >= 4 && s[:4] == `\??\` { 1031 s = s[4:] 1032 switch { 1033 case len(s) >= 2 && s[1] == ':': // \??\C:\foo\bar 1034 // do nothing 1035 case len(s) >= 4 && s[:4] == `UNC\`: // \??\UNC\foo\bar 1036 s = `\\` + s[4:] 1037 default: 1038 // unexpected; do nothing 1039 } 1040 } else { 1041 // unexpected; do nothing 1042 } 1043 } 1044 case _IO_REPARSE_TAG_MOUNT_POINT: 1045 data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1046 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1047 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1048 if len(s) >= 4 && s[:4] == `\??\` { // \??\C:\foo\bar 1049 s = s[4:] 1050 } else { 1051 // unexpected; do nothing 1052 } 1053 default: 1054 // the path is not a symlink or junction but another type of reparse 1055 // point 1056 return -1, ENOENT 1057 } 1058 n = copy(buf, []byte(s)) 1059 1060 return n, nil 1061 }